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| + | ====== 3. Ring fountain ====== | ||
| + | When a flat metal ring falls from a certain height into a water tank, it generates a fountain that canshoot water high into the air. How does the maximum height of the fountain depend on the ring's parameters? | ||
| + | ====== 3. 环形喷泉 ====== | ||
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| + | 当一个扁平的金属环从一定高度落入水箱时，会产生能将水喷向高空的喷泉。喷泉能达到的最大高度与环的参数有何关系？ | ||